Despite his conviction that demonic possession is just so much supersitious mumbo jumbo, Catholic priest-in-training Michael Kovak (Colin O'Donoghue) journeys to Rome to attend a special exorcism school being taught at the Vatican. Before long, true-believer Father Lucas (Anthony Hopkins) introduces the young cleric to the devil's power firsthand. Director Mikael Håfström helms this graphic supernatural thriller inspired by a true story.